nrf_rpc: rpc_utils: fix stack overflow trigger

Damian-Nordic · rlubos · commit 7b1ea166fb3c · 2025-07-07T11:47:51.000+02:00
Write to the stack array to prevent the compiler from
optimizing it away.

Signed-off-by: Damian Krolik &lt;damian.krolik@nordicsemi.no&gt;
diff --git a/subsys/nrf_rpc/rpc_utils/server/crash_gen.c b/subsys/nrf_rpc/rpc_utils/server/crash_gen.c
@@ -15,7 +15,10 @@ K_WORK_DELAYABLE_DEFINE(crash_work, crash_work_handler);
 
 static void do_stack_overflow(void)
 {
-	volatile uint8_t arr[(256 * 1024)] __attribute__((unused));
+	volatile uint8_t arr[CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE];
+
+	/* Write to 'arr' to prevent the compiler from optimizing it away. */
+	arr[0] = 1;
 }
 
 static void do_assert(void)
@@ -28,7 +31,9 @@ static void do_assert(void)
 
 static void do_hardfault(void)
 {
-	volatile uint32_t value __attribute__((unused)) = 1 / 0;
+	volatile uint32_t value;
+
+	value = 1 / 0;
 }
 
 #pragma GCC diagnostic pop

Original file line number	Diff line number	Diff line change
`@@ -15,7 +15,10 @@ K_WORK_DELAYABLE_DEFINE(crash_work, crash_work_handler);`
`15`	`15`
`16`	`16`	`static void do_stack_overflow(void)`
`17`	`17`	`{`
`18`		`- volatile uint8_t arr[(256 * 1024)] __attribute__((unused));`
	`18`	`+ volatile uint8_t arr[CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE];`
	`19`	`+`
	`20`	`+ /* Write to 'arr' to prevent the compiler from optimizing it away. */`
	`21`	`+ arr[0] = 1;`
`19`	`22`	`}`
`20`	`23`
`21`	`24`	`static void do_assert(void)`
`@@ -28,7 +31,9 @@ static void do_assert(void)`
`28`	`31`
`29`	`32`	`static void do_hardfault(void)`
`30`	`33`	`{`
`31`		`- volatile uint32_t value __attribute__((unused)) = 1 / 0;`
	`34`	`+ volatile uint32_t value;`
	`35`	`+`
	`36`	`+ value = 1 / 0;`
`32`	`37`	`}`
`33`	`38`
`34`	`39`	`#pragma GCC diagnostic pop`